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Math Help - Please Help Me With My Calculator Questions

  1. #1
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    Please Help Me With My Calculator Questions

    I can do some of the problems on this, but some I can't figure out. The answers on these listed I am getting wrong, I covered up the ones I know. I am obviously making a mistake typing them in my calculator. The ones with the e not in the exponent but the base, I can't figure out how to enter that. I use 2nd-LN for e^.

    Any help? My calculator is a ti-30






    Last edited by pexterra; April 15th 2014 at 10:49 AM.
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  2. #2
    MHF Contributor ebaines's Avatar
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    Re: Please Help Me With My Calculator Questions

    Is that a "Reverse Polish Notation" (RPN) calculator? I see an Enter button and no equals sign, so I'm guessing it is. You say it's a TI-30, but those were made back in the mid-70's.

    Anyways, to use RPN you always start deep in the formula and work your way toward the outside, as opposed tp left-to-right as on a "normal" calculator. So for  e^{5 \sqrt 2-2 \pi} start with the square root, then multiply by 5 then do the 2 pi calculation, then subtract that result from the first, then "exponentiate" the result. The sequence is:

    2 2nd x^2
    5 X
    2 Enter
    Pi X
    Minus
    2nd LN
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  3. #3
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    Re: Please Help Me With My Calculator Questions

    Quote Originally Posted by ebaines View Post
    Is that a "Reverse Polish Notation" (RPN) calculator? I see an Enter button and no equals sign, so I'm guessing it is. You say it's a TI-30, but those were made back in the mid-70's.

    Anyways, to use RPN you always start deep in the formula and work your way toward the outside, as opposed tp left-to-right as on a "normal" calculator. So for  e^{5 \sqrt 2-2 \pi} start with the square root, then multiply by 5 then do the 2 pi calculation, then subtract that result from the first, then "exponentiate" the result. The sequence is:

    2 2nd x^2
    5 X
    2 Enter
    Pi X
    Minus
    2nd LN
    here is a better picture. i don't think it's from the 70's because I got it from staples a couple weeks ago. probably i just named it wrong. there is an equal sign under enter. it just got cut out of the picture.


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  4. #4
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    Re: Please Help Me With My Calculator Questions

    but hey! i think i got the ones without the e in the exponent down. all i have left i think are the ones with the e's in the exponents. i can't seem to find out how to put the e there though?
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  5. #5
    MHF Contributor ebaines's Avatar
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    Re: Please Help Me With My Calculator Questions

    Never mind my previous post - I figured out what you have is a TI-30XIIS calculator: TI-30X IIS - Key features by Texas Instruments - US and Canada

    It is not RPN, so what you can do is this:

    5 \times 2\ 2nd\  x^2 + 2 \times \pi \ = \ 2nd \ \ln
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  6. #6
    MHF Contributor ebaines's Avatar
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    Re: Please Help Me With My Calculator Questions

    Our posts overlapped...

    Remember that e = e^1. So to get e use: 1 2nd LN
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  7. #7
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    Re: Please Help Me With My Calculator Questions

    hold on, trying it now
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  8. #8
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    Re: Please Help Me With My Calculator Questions

    The answer is coming out wrong.

    im posting it in 2 pictures so you can see the whole problem i typed in.


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  9. #9
    MHF Contributor ebaines's Avatar
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    Re: Please Help Me With My Calculator Questions

    To calculate:  10^{3e-4 \sqrt 3 } try this:

    10^(3 x 1 e^x - 4 x 3 \sqrt {} )
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